JPH0669593B2 - Automatic frame bending device for bending round bars or strips - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic frame bending device for bending round bar steel or strip steel.

Conventional technology and its problems For example, in manufacturing a frame for a spring core of a mattress or a cushioned furniture, a wire rod such as a round bar steel or a strip steel is bent into a rectangle so that both ends of the wire rod can be abutted at an intermediate portion of one side thereof. After that, the frames are completed by butt-welding the both ends butted together or closed in a loop by a fixing tool such as a clip wrapping the both ends.

In the bending process of the rectangular frame, the wire rod is fed from the bent portion to the downstream side, and the wire rod is fed by a length that forms one part of the sides to be butted. Here, after being bent at a right angle, it is further fed in a predetermined dimension in the feeding direction and bent at a right angle at that position, and thus feeding and bending are repeated four times to form a rectangle. After this, the wire is cut at the butting point.

Regarding the bending process of such a rectangular frame, the conventional wire bending device has the following disadvantages.

During bending, deformation in the direction perpendicular to the plane following the bending operation tends to occur, so in the conventional bending device, a cutting device is arranged between the wire feed roll and the bending portion. (For example, JP-A-56-102317). In this case, after finishing the bending work at the above-mentioned four places, the wire rod is moved so that the position corresponding to the butting position comes to the position of the cutting device, and the wire is cut there. However, when the size of the frame to be obtained is small and the position corresponding to the above-mentioned abutting position is on the downstream side of the position of the cutting device, the already bent wire rod is moved over the bent portion to the upstream side. I can't let you do it. Therefore, there is a problem that the size of the frame that can be processed is limited depending on the position of the cutting device with respect to the bent portion.

Further, in the case of forming a large frame such as a mattress, the size of the bending device becomes large, and a large space for drawing out the wire from the bent portion is required.

An object of the present invention is to provide a folding device in which the size of a frame or the like that can be processed is free, and which is compact and can process a large frame such as a frame for a mattress.

Means for Solving the Problems The above-mentioned object of the present invention is to provide a reel for supplying a wire and a sequentially provided downstream of the reel in an automatic bending device for feeding the wire in the longitudinal direction and bending it at a predetermined position. Was
A measuring roll for measuring the feed length of the wire rod, a pulling roll for feeding the wire rod in the longitudinal direction, a bent portion for bending the wire rod, a cutting device provided in the vicinity of the bent portion to separate the bent wire rod,
And a skewed plate for guiding the frame after bending, and an operation unit for performing microprocessor control of feeding, bending and cutting of the wire rod, and the cutting device feeds the wire rod that has passed through the bent portion. This is achieved by an automatic frame bending device for bending round bars or strips, characterized in that it has counter-guides for guiding in the direction.

The automatic frame bending device has a rotor for applying a twist in both forward and reverse directions and a roll for applying bending in various directions between the reel and the measuring roll when the wire passes. Is preferably further provided.

In the automatic frame bending device, the bending portion has a fixed shaft arranged on one side of the wire rod fed by the pulling roll, and a fixed shaft side from a position opposite to the fixed shaft with respect to the wire rod. It is preferable to have a pin provided so as to be rotatable around the fixed axis to a position.

In the automatic frame bending device, the bending portion is guided along a central disc having a groove for accommodating the wire rod fed by the pulling roll, and along the outer periphery of the central disc according to an angle to be bent. And a folding roll.

In the automatic frame bending device, the oblique plate includes a guide surface having an arc-shaped cross section that guides the wire rod that has passed through the facing guide portion in a direction that deviates from a plane including the feed direction and the bending direction. Is preferred.

In another embodiment of the frame bending device according to the embodiment of the present invention, the bent portion is configured to include a pin that can be swiveled around a fixed shaft, and the round bar steel or band steel to be bent is composed of a fixed shaft and a pin. You can pass through. This pin is driven by a hydraulic motor on the swivel arm, and the operation is always maintained with high accuracy during machining.

In another form, the fold comprises a central disc and a folding roll, the central disc comprising a rotary groove for accommodating a round bar or strip to be folded, the folding roll being at an angle to be folded. Correspondingly, it is guided along the outer circumference of the central disc in the swivel arm part. As a result, a very accurate bending process in a desired angle range is realized, and the central disk or the bending roll can be mounted from the front side so that the angle can be easily set or changed.

The cutting device is provided at the wire rod reaching position on the downstream side of the bent portion, and the round bar steel or the strip steel to be cut runs inside the facing guide portion provided in the cutting device.

In this way, it is possible to accurately guide the round bar steel or strip steel by the traction device in order to accurately cut it in millimeters.

The slanting plate is formed at the end of the automatic frame folding device in a semi-circular shape, preferably in a dome shape, so as to protrude high. The frame part that has been bent is guided by the oblique plate, and is elastically bent forward of the front of the frame folding device along the semi-circular oblique plate without causing deformation of the completed frame. The longitudinal length of the folding device can be reduced by the dimensions of the longitudinally extended frame in the absence of the skew plate. Therefore, the device can be used in a space smaller than that of the conventional device.

Embodiment Hereinafter, an embodiment of the automatic frame bending apparatus according to the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the reel 13 is provided as the first process on the upstream side of the process of the automatic frame bending device 14. The wire rod 3, particularly the round bar steel, is conveyed from the reel 13 to the wire rod straightening device 2 a and is pulled by the pulling roll 5. When the wire rod is a strip steel, the use of the wire rod straightening device 2a can be omitted.

A pair of measuring rolls 4 having no driving device is provided on the upstream side of the pulling rolls 5 provided as a pair, and the measuring roll 4 allows the wire rod to be cut after bending to have a height of a millimeter unit. Measured by precision.

In the embodiment shown in FIG. 1, the folding device 6 includes a pin 8 that is swung by a swivel arm that is hydraulically driven, and a fixed shaft 7 that bends a lumber or strip by swiveling the pin. It is also possible to provide the fixed shaft 7 and the pin 8 with suitable grooves for guiding the wire.

On the downstream side of the bent portion 6, a facing guide portion 10 that can simultaneously act as a guide device for the strip steel, and a cutting device 9 for cutting the strip steel.
And are provided.

The device itself, in particular the drive, bending unit, wire straightening device or measuring roll, is microprocessor-controlled by the operating unit 12.

In the automatic frame folding device 14, especially the rotor 1 and the roll 2
Is provided, the wire 3 passes through the roll, and the roll 2 is also driven. Combined with the clockwise rotation of the rotor 1,
The wire is straightened so that no post-processing is required and the frame is flattened and angled correctly after bending.

It is desirable that the wire rod straightening device 2a does not wear and that the wire rod is operated without friction, and in combination with the straightening process by twisting the wire rod by the rotor 1, the wire rod can be straightened easily and accurately. In this way, wear-free operation of the wire rod straightening device is realized, and further, since the wire rod straightening device is provided on the upstream side of the bending portion, the frame is formed in a special manner in the frame bending device in the wire rod conveying direction. The measurement roll 4 which remains flat and does not require post-processing straightening processing by a simple arrangement is composed of a pair of rolls, and electronically measures the length of the wire rod conveyed by the drawing or forward drive. Used for. This measurement is carried out by means of an electronic pulse generator whose axis is coupled to the shaft of one of the measuring rolls.

A pair of rolls provided downstream of the measuring roll 4 is a pulling roll 5 for pulling a wire rod, and the pulling roll pulls or drives a wire rod or a strip member having a length necessary for frame production. is there. When a material of a predetermined length is fed by the pulling roll 5, the material is braked with an accuracy of millimeter so that a desired bending process is accurately performed.

The pulling roll 5 is driven by a hydraulic motor controlled by the operation unit 12. Two types of measurements, fast and slow, can be utilized so that the length of the material can be quantified with millimeter accuracy. The low speed is used to control the hydraulic motor by narrowing the amount of oil to a flow rate corresponding to the speed to pass the last 1 cm in the length of each side of the frame. As described above, in the bending device, the feeding speed of the wire rod to be conveyed is remarkably reduced, so that it is possible to perform measurement with millimeter accuracy in combination with the action of pushing the wire rod to the bent portion.

The bent portion 6 is also driven by a hydraulic motor and is highly accurate in the range from the start to the final or stop.

The cutting device 9 also includes a hydraulic cutter, and the opposing guide portion 10 of the cutting device 9 does not hinder the passage of the wire rod when the wire rod passes through this guide device after bending, and also enables accurate cutting. Is provided as is.

A semi-circular plate or skew plate 11 is provided so that the length of the frame projecting in the longitudinal direction of the frame folding device can be shortened when there is no skew plate. It is bent along the shape of 11 toward the front of the front of the frame bending device in the range of elasticity so as not to cause permanent deformation. As a result, the frame folding device can be installed even in an extremely small space.

The frame bending device 14 is electronically programmed by the operation unit 12, and in particular, the wire rod straightening device 2a, the pulling roll 5, the measuring roll 4, the bending portion 6 and the cutting device 9 are programmed by a computer, Is automatically executed.

The operation of the automatic frame folding device is as follows. That is, the wire 3 is pulled out from the reel 13 and linearly passes through the rotating rotor 1, and the length of each side of the frame is determined by the pulling roll 5 and the measuring roll. Reduce the feed rate of the wire before reaching the feed length corresponding to the length of each side,
The extrusion speed with respect to the bent portion is controlled so that the wire rod is processed with an accuracy of millimeter unit.

After the wire rod 3 is held, the wire rod is bent at a desired angle inside the bending portion 6. Further, when the arm of the bending portion 6 pivots and returns to the basic position, the wire rod is further extruded, and the bending operation is repeated until it reaches the programmed shape.

After the wire rod is cut by the cutting device 9, the work of passing the wire rod again is started under the control of the operation unit 12.

When the wire rod has a rectangular cross section rather than a round cross section, straightening can be omitted. In that case, operations other than the work in the wire straightening apparatus are repeated.

FIG. 2 shows another embodiment of the bending part 6, in which the round bar or strip to be bent is bent around a disc.
In the figure, a fixed roll or centering disc 52 is provided,
A groove 55 for accommodating a round bar steel or a strip steel is provided around the disc.

A round steel bar or a steel strip to be bent is made to travel in the groove 55, is bent by the bending roll 53, and is bent by the bending roll 53.
Is in contact with the centering disc 52 from above the disc 52, and the arrow in FIG.
A central disc that swivels in the direction indicated by 54, or is stationary
The bending roll 53 rotates around 52 to bend the round bar or the steel strip within a desired angle range.

FIG. 3 shows a state in which the folding roll 53 is guided by the swivel arm along the circumference of the central disk 52 for folding the round steel bar or the strip steel.

As shown in FIG. 1, FIG. 2 and FIG. 3, at the extension portion on the downstream side of the bent portion 6, an opposed guide portion provided at the extension portion of the wire rod guide device 57 for round bar steel or strip steel by accurate positioning. A cutting device 9 is provided. As a result, the material is always moved into the opposing guide portion 10 even after bending and can be easily cut by the hydraulically operated shear provided above the material.

Even after the bending process, the round bar steel or the strip steel is always held by the facing guide portion 10 in association with the wire rod guide device 57, so that the frame bending device can be guaranteed to operate without trouble.

The automatic frame bending apparatus according to the embodiment of the present invention can be easily incorporated in a production line for manufacturing mattresses or cushioned furniture.

EFFECT OF THE INVENTION In the automatic frame bending device according to the present invention, a bent portion for bending the wire rod is provided in the downstream direction of supplying the wire rod, and the bent wire rod provided in the vicinity of the bent portion is provided. A cutting device for cutting is provided. In the manufacture of a large rectangular frame such as a mattress frame, it is necessary to bend the wire material at four points and then cut the wire material at a butt-corresponding point in the center of one side. However, in the present invention, as described above, Since the cutting device is provided on the downstream side of the bent portion, by sending the bent wire rod to the downstream side, it is possible to reach the cutting position regardless of the length or the short length. Moreover, since the cutting device is provided with the facing guide portion that guides the wire rod that has passed through the bending portion in the feeding direction, even if the bent frame is deformed in the direction perpendicular to the feeding direction, there is no problem. Without passing through the working range of the cutting device. Therefore, the processable size of the frame can be freely selected. Further, since the oblique plate for guiding the frame after bending is provided, the whole is made compact. In the case of a large frame, the conventional device requires a long space for feeding the frame fed out from the folding portion in the longitudinal direction of the folding device, but in the folding device according to the present invention, it is fed out. Since the frame is guided to the front side of the front of the folding device along the surface of the oblique plate, it can be made compact in the longitudinal direction of the folding device.

Further, when the wire rod straightening device is provided on the upstream side of the bent portion, the frame formed by the round bar is formed in a state in which the distortion is corrected in advance. There is no need to do it.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an automatic frame bending apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of a bent portion before bending a wire rod, and FIG. 3 is bending of the wire rod. FIG. 4 is a perspective view showing a bent portion afterward, and FIG. 4 is a perspective view showing an outline of a spring mattress manufacturing line incorporating the automatic frame bending apparatus of FIG.

(1) ...... Rotor (2) …… Roll (2a) …… Wire rod straightening device (4) …… Measuring roll (5) …… Traction roll (6) …… Bending part (7) …… Fixed shaft (8) ...... Pin (11) ...... Oblique plate (12) ...... Operation unit (13) ...... Reel (14) ...... Automatic frame folding device (52) ...... Central disk (53) ...... Folding roll

Claims (5)

[Claims] 1. An automatic bending device for feeding a wire rod in a longitudinal direction to bend the wire rod at a predetermined position, and measures a reel for supplying the wire rod and a feed length of the wire rod which is sequentially provided on the downstream side of the reel. A measuring roll, a pulling roll that feeds the wire in the longitudinal direction, a bending part for bending the wire, a cutting device provided in the vicinity of the bending part for separating the bent wire, and a frame after bending. The cutting device includes a skew plate and an operation unit that controls the feeding, bending and cutting of the wire rod by a microprocessor, and the cutting device includes a facing guide portion that guides the wire rod that has passed through the bent portion in the feed direction. An automatic frame bending device for bending round bar steel or strip steel. 2. A wire rod straightening device further comprising, between the reel and the measuring roll, a rotor for twisting the wire in both forward and reverse directions and a roll for bending in various directions when the wire passes. The automatic frame bending device for bending the round bar steel or the strip steel according to claim 1. 3. The fixed portion, wherein the bent portion is arranged on one side of the wire rod fed by the pulling roll, and from the position opposite to the fixed shaft to the position on the fixed shaft side with respect to the wire rod. The automatic frame bending device according to claim 1, further comprising a pin that is provided so as to be rotatable around a fixed axis. 4. A center disc having a groove for accommodating a wire rod fed by the pulling roll, and a bend guided along the outer periphery of the center disc according to an angle to be bent. A roll is provided.
Automatic frame folding device described. 5. The slanting plate is provided with a guide surface having an arcuate cross section for guiding the wire rod that has passed through the facing guide portion in a direction out of a plane including the feed direction and the bending direction. The automatic frame bending device according to claim 1.